Except for a couple of these (and I bought those here), I am the original owner.  I have bought and sold things on here from several people.  I have been mining in Vegas for years, no I am not a thief.  I have a bunch of bitmain coupons to prove i’ve made purchases directly from them.  That’s pretty ridiculous that you would instantly make an “almost” accusation like that.  I suppose you know every crypto miner in Vegas?  There are way more miners in Vegas than you think.  You don’t know me and I don’t know you.  And I don’t think I want to know you.

To answer the question about how long have they been running, that depends.  Some have been in use for years some a few months.  At this point I couldn’t tell you which power supply is which.  They were run in a pristine data center always kept at 72°f.  The miners are very clean except for the one I bought from philipma1957, it’s pretty dirty.